<template>
  <SvgIcon
    :size="size"
    :name="getSvgIcon"
    v-if="isSvgIcon"
    :class="[$attrs.class, 'anticon']"
    :spin="spin"
  />
  <span
    v-else
    ref="elRef"
    :class="[$attrs.class, 'app-iconify anticon', spin && 'app-iconify-spin']"
    :style="getWrapStyle"
  ></span>
</template>
<script lang="ts" setup>
import type { PropType } from "vue";
import {
  ref,
  watch,
  onMounted,
  nextTick,
  unref,
  computed,
  CSSProperties,
} from "vue";
import SvgIcon from "./src/SvgIcon.vue";
import Iconify from "@purge-icons/generated";
import { isString } from "@/utils/is";
import { propTypes } from "@/utils/propTypes";

const SVG_END_WITH_FLAG = "|svg";

defineOptions({ name: "Icon" });

const props = defineProps({
  // icon name
  icon: propTypes.string,
  // icon color
  color: propTypes.string,
  // icon size
  size: {
    type: [String, Number] as PropType<string | number>,
    default: 16,
  },
  spin: propTypes.bool.def(false),
  prefix: propTypes.string.def(""),
});

const elRef = ref(null);

const isSvgIcon = computed(() => props.icon?.endsWith(SVG_END_WITH_FLAG));
const getSvgIcon = computed(() => props.icon.replace(SVG_END_WITH_FLAG, ""));
const getIconRef = computed(
  () => `${props.prefix ? props.prefix + ":" : ""}${props.icon}`,
);

const update = async () => {
  if (unref(isSvgIcon)) return;

  const el: any = unref(elRef);
  if (!el) return;

  await nextTick();
  const icon = unref(getIconRef);
  if (!icon) return;

  const svg = Iconify.renderSVG(icon, {});
  if (svg) {
    el.textContent = "";
    el.appendChild(svg);
  } else {
    const span = document.createElement("span");
    span.className = "iconify";
    span.dataset.icon = icon;
    el.textContent = "";
    el.appendChild(span);
  }
};

const getWrapStyle = computed((): CSSProperties => {
  const { size, color } = props;
  let fs = size;
  if (isString(size)) {
    fs = parseInt(size, 10);
  }

  return {
    fontSize: `${fs}px`,
    color: color,
    display: "inline-flex",
  };
});

watch(() => props.icon, update, { flush: "post" });

onMounted(update);
</script>
<style lang="less">
.app-iconify {
  display: inline-block;
  // vertical-align: middle;

  &-spin {
    svg {
      animation: loadingCircle 1s infinite linear;
    }
  }
}

span.iconify {
  display: block;
  min-width: 1em;
  min-height: 1em;
  border-radius: 100%;
  background-color: @iconify-bg-color;
}
</style>
